Faced with such a strong development, John B. Gulidov, a professor of LFP olives more than ten years ago, found that one of the compounds of LFP olives John B.Goodenough probably did not expect that one was phosphate (usually used for fertilizer). The micron material composed of iron lithium ions has quickly changed many important industrial development; of course, patent disputes have continued. Three companies including A123, Aleees, Valence did not think that their compound patents had any infringement issues, but they did The opponents of Texas University and Quebec Power Corporation (Hydro-Quebec) certainly do not think so.

　　In the US patent lawsuit in 2005 and 2006, the University of Texas and Quebec Electric Power Corporation claimed that all batteries using Lifepo4 positive poles violated their US patent number 5910382 and US patent 6514640, and involved some lithium ion batteries. The electrode material used in it. The '382 and' 640 patents claim that the battery positive materials have a special crystal structure and chemical formula. But obviously for A123 and Aleees, they all think that their positive materials have different crystal structures and chemical formulas. Therefore, there is no problem of patent infringement.

　　On April 7, 2006, a decision -making ruling in Massachusetts in the United States District Court of the United States, LFP olive materials with different crystal structures and chemical formulas, did not violate these patents. After these related lawsuits, the University of Texas, the University of Texas in the United States, had to amend the scope of 382 patents to make their patents narrow; these LFP companies with different crystal structures took advantage of the victory to pursue. Capture and two new claims required for review. At present, the patent work of 640 is still ongoing, and the conclusion of the LFP material patent war has not yet announced that the smoke disappears.

　　On December 9, 2008, the ruling of the European Patent Agency (EPO) objections withdrew the European patent of Limpo4 awarded by the University of Texas. The verdict is also equivalent to eliminating any risk of infringing key materials for the next -generation electric vehicle batteries in Europe.

　　The reason why the Limpo4 patent is revoked is that the patent lacks novelty. According to the ruling, the European Patent No. 0904607, which was originally awarded by the University of Texas, has been completely revoked by the European Patent Administration. The University of Texas appealed to this patent revocation resolution. In other words, the University of Texas has disappeared according to the possibility of patent infringement claims based on this European patent.

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